Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 286 insertions, 0 deletions

diff --git a/kernel/drivers/net/wireless/libertas/rx.c b/kernel/drivers/net/wireless/libertas/rx.c
new file mode 100644
index 000000000..e446fed7b
--- /dev/null
+++ b/kernel/drivers/net/wireless/libertas/rx.c
@@ -0,0 +1,286 @@
+/*
+ * This file contains the handling of RX in wlan driver.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/etherdevice.h>
+#include <linux/hardirq.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/export.h>
+#include <net/cfg80211.h>
+
+#include "defs.h"
+#include "host.h"
+#include "radiotap.h"
+#include "decl.h"
+#include "dev.h"
+#include "mesh.h"
+
+struct eth803hdr {
+	u8 dest_addr[6];
+	u8 src_addr[6];
+	u16 h803_len;
+} __packed;
+
+struct rfc1042hdr {
+	u8 llc_dsap;
+	u8 llc_ssap;
+	u8 llc_ctrl;
+	u8 snap_oui[3];
+	u16 snap_type;
+} __packed;
+
+struct rxpackethdr {
+	struct eth803hdr eth803_hdr;
+	struct rfc1042hdr rfc1042_hdr;
+} __packed;
+
+struct rx80211packethdr {
+	struct rxpd rx_pd;
+	void *eth80211_hdr;
+} __packed;
+
+static int process_rxed_802_11_packet(struct lbs_private *priv,
+	struct sk_buff *skb);
+
+/**
+ * lbs_process_rxed_packet - processes received packet and forwards it
+ * to kernel/upper layer
+ *
+ * @priv:	A pointer to &struct lbs_private
+ * @skb:	A pointer to skb which includes the received packet
+ * returns:	0 or -1
+ */
+int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
+{
+	int ret = 0;
+	struct net_device *dev = priv->dev;
+	struct rxpackethdr *p_rx_pkt;
+	struct rxpd *p_rx_pd;
+	int hdrchop;
+	struct ethhdr *p_ethhdr;
+	static const u8 rfc1042_eth_hdr[] = {
+		0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
+	};
+
+	lbs_deb_enter(LBS_DEB_RX);
+
+	BUG_ON(!skb);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
+		ret = process_rxed_802_11_packet(priv, skb);
+		goto done;
+	}
+
+	p_rx_pd = (struct rxpd *) skb->data;
+	p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
+		le32_to_cpu(p_rx_pd->pkt_ptr));
+
+	dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
+
+	lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
+		 min_t(unsigned int, skb->len, 100));
+
+	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
+		lbs_deb_rx("rx err: frame received with bad length\n");
+		dev->stats.rx_length_errors++;
+		ret = -EINVAL;
+		dev_kfree_skb(skb);
+		goto done;
+	}
+
+	lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
+		skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
+		skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
+
+	lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
+		sizeof(p_rx_pkt->eth803_hdr.dest_addr));
+	lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
+		sizeof(p_rx_pkt->eth803_hdr.src_addr));
+
+	if (memcmp(&p_rx_pkt->rfc1042_hdr,
+		   rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
+		/*
+		 *  Replace the 803 header and rfc1042 header (llc/snap) with an
+		 *    EthernetII header, keep the src/dst and snap_type (ethertype)
+		 *
+		 *  The firmware only passes up SNAP frames converting
+		 *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
+		 *
+		 *  To create the Ethernet II, just move the src, dst address right
+		 *    before the snap_type.
+		 */
+		p_ethhdr = (struct ethhdr *)
+		    ((u8 *) &p_rx_pkt->eth803_hdr
+		     + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
+		     - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
+		     - sizeof(p_rx_pkt->eth803_hdr.src_addr)
+		     - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
+
+		memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
+		       sizeof(p_ethhdr->h_source));
+		memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
+		       sizeof(p_ethhdr->h_dest));
+
+		/* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
+		 *   that was removed
+		 */
+		hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd;
+	} else {
+		lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
+			(u8 *) &p_rx_pkt->rfc1042_hdr,
+			sizeof(p_rx_pkt->rfc1042_hdr));
+
+		/* Chop off the rxpd */
+		hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd;
+	}
+
+	/* Chop off the leading header bytes so the skb points to the start of
+	 *   either the reconstructed EthII frame or the 802.2/llc/snap frame
+	 */
+	skb_pull(skb, hdrchop);
+
+	priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
+
+	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
+	dev->stats.rx_bytes += skb->len;
+	dev->stats.rx_packets++;
+
+	skb->protocol = eth_type_trans(skb, dev);
+	if (in_interrupt())
+		netif_rx(skb);
+	else
+		netif_rx_ni(skb);
+
+	ret = 0;
+done:
+	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
+
+/**
+ * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
+ * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
+ *
+ * @rate:	Input rate
+ * returns:	Output Rate (0 if invalid)
+ */
+static u8 convert_mv_rate_to_radiotap(u8 rate)
+{
+	switch (rate) {
+	case 0:		/*   1 Mbps */
+		return 2;
+	case 1:		/*   2 Mbps */
+		return 4;
+	case 2:		/* 5.5 Mbps */
+		return 11;
+	case 3:		/*  11 Mbps */
+		return 22;
+	/* case 4: reserved */
+	case 5:		/*   6 Mbps */
+		return 12;
+	case 6:		/*   9 Mbps */
+		return 18;
+	case 7:		/*  12 Mbps */
+		return 24;
+	case 8:		/*  18 Mbps */
+		return 36;
+	case 9:		/*  24 Mbps */
+		return 48;
+	case 10:		/*  36 Mbps */
+		return 72;
+	case 11:		/*  48 Mbps */
+		return 96;
+	case 12:		/*  54 Mbps */
+		return 108;
+	}
+	pr_alert("Invalid Marvell WLAN rate %i\n", rate);
+	return 0;
+}
+
+/**
+ * process_rxed_802_11_packet - processes a received 802.11 packet and forwards
+ * it to kernel/upper layer
+ *
+ * @priv:	A pointer to &struct lbs_private
+ * @skb:	A pointer to skb which includes the received packet
+ * returns:	0 or -1
+ */
+static int process_rxed_802_11_packet(struct lbs_private *priv,
+	struct sk_buff *skb)
+{
+	int ret = 0;
+	struct net_device *dev = priv->dev;
+	struct rx80211packethdr *p_rx_pkt;
+	struct rxpd *prxpd;
+	struct rx_radiotap_hdr radiotap_hdr;
+	struct rx_radiotap_hdr *pradiotap_hdr;
+
+	lbs_deb_enter(LBS_DEB_RX);
+
+	p_rx_pkt = (struct rx80211packethdr *) skb->data;
+	prxpd = &p_rx_pkt->rx_pd;
+
+	/* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */
+
+	if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
+		lbs_deb_rx("rx err: frame received with bad length\n");
+		dev->stats.rx_length_errors++;
+		ret = -EINVAL;
+		kfree_skb(skb);
+		goto done;
+	}
+
+	lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
+	       skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
+
+	/* create the exported radio header */
+
+	/* radiotap header */
+	memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
+	/* XXX must check radiotap_hdr.hdr.it_pad for pad */
+	radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
+	radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
+	radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
+	/* XXX must check no carryout */
+	radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
+
+	/* chop the rxpd */
+	skb_pull(skb, sizeof(struct rxpd));
+
+	/* add space for the new radio header */
+	if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
+	    pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
+		netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);
+		ret = -ENOMEM;
+		kfree_skb(skb);
+		goto done;
+	}
+
+	pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
+	memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
+
+	priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
+
+	lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
+	dev->stats.rx_bytes += skb->len;
+	dev->stats.rx_packets++;
+
+	skb->protocol = eth_type_trans(skb, priv->dev);
+
+	if (in_interrupt())
+		netif_rx(skb);
+	else
+		netif_rx_ni(skb);
+
+	ret = 0;
+
+done:
+	lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
+	return ret;
+}